add download_dir property

[Tathar]

close #

[codecov]

Codecov Report

Merging #62 (dfc3e10) into master (3052051) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #62      +/-   ##
==========================================
- Coverage   70.73%   70.72%   -0.02%     
==========================================
  Files          12       12              
  Lines        1155     1158       +3     
==========================================
+ Hits          817      819       +2     
- Misses        338      339       +1     

Flag	Coverage Δ
py_36	?
py_37	?
py_38	?
py_39	70.70% <66.66%> (-0.02%)	⬇️
py_pypy3	70.47% <66.66%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
transmission_rpc/torrent.py	57.28% <66.66%> (+0.09%)	⬆️

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[trim21]

please document which transmission and RPC version this property is available in source code comments.

[trim21]

.